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Start implementing basic hardware support for CATS, based on new autoconfiguration
mechanism. This effectively uses bus_space to abstract children of parents.
Some info about these drivers:
hostio is a host memory-mapped i/o - one and only child of 'root';
footbridge is just a proxy for now;
fuart is a DC21285 UART driver which fills uart_attach_args and attaches
com, which is machine independent driver;

This all is not finished yet (just quick hacks), but commit it so i could work at home.

/*
 * $Id: hostiovar.h,v 1.1 2008/08/08 13:18:16 nbrk Exp $
 */
#ifndef _DEV_ARM_CATS_HOSTIOVAR_H_
#define _DEV_ARM_CATS_HOSTIOVAR_H_
/*
 * bus_space glue.
 */
int	hostio_map(void *cookie, bus_addr_t addr, bus_size_t size, int flags, bus_space_handle_t *ioh);
uint8_t	hostio_read_1(void *cookie, bus_space_handle_t ioh, bus_size_t off);
uint16_t	hostio_read_2(void *cookie, bus_space_handle_t ioh, bus_size_t off);
uint32_t	hostio_read_4(void *cookie, bus_space_handle_t ioh, bus_size_t off);
void	hostio_write_1(void *cookie, bus_space_handle_t ioh, bus_size_t off, uint8_t data);
void	hostio_write_2(void *cookie, bus_space_handle_t ioh, bus_size_t off, uint16_t data);
void	hostio_write_4(void *cookie, bus_space_handle_t ioh, bus_size_t off, uint32_t data);

/*
 * Our tag.
 * One and only.
 */
struct bus_space hostio_bs_tag = {
	NULL, /* cookie */
	hostio_map,
	NULL, /* unmap */
	NULL, /* subregion */
	NULL, /* barrier */
	hostio_read_1,
	hostio_read_2,
	hostio_read_4,
	hostio_write_1,
	hostio_write_2,
	hostio_write_4,
};

struct hostio_softc {
	bus_space_tag_t	sc_iot;

};

#endif /* !_DEV_ARM_CATS_HOSTIOVAR_H_ */